Question 1

Discuss dimensioning a thread hole.

Accepted Answer

The same system of dimensioning that is used to specify external threads applies to internal threads. However, in the case of internal threads, the thread length is specified as the depth of thread.

Question 2

List and describe the three regular class fits for internal and external threads.

Accepted Answer

Fits that are Class 1A (where A designates external threads) and Class 1B (B for internal threads) provide the greatest allowance and tolerances between the fitted parts. The Class 2A and Class 2B fit is the most widely used as it provides an acceptable minimum of clearance between the mating parts. The Class 3A and Class 3B fit is used for great accuracy. When the class of fit is given, it is usually included on the drawing as part of the screw thread notation.

Question 3

One of the most practical and widely used methods of producing internal threads is to cut them with a round, formed, thread-cutting tool called a ____.

Accepted Answer

A)  binder 
B)  bore 
C)  grinder 
D)  tap 
A)  binder 
B)  bore 
C)  grinder 
D)  tap D

Question 4

How are the three regular classes of fits for external and internal threads distinguished from one another?

Accepted Answer

There are three regular classes of fits

Question 5

The accompanying figure is an example of a(n) ____ thread.

Accepted Answer

A)  right-hand 
B)  left-hand 
C)  top 
D)  bottom 
A)  right-hand 
B)  left-hand 
C)  top 
D)  bottom

Question 6

Describe how a part can be threaded.

Accepted Answer

A part may be threaded internally throug

Question 7

In the case of internal threads, the thread length is specified as the ____.

Accepted Answer

A)  depth of thread 
B)  height of thread 
C)  width per thread 
D)  length per thread 
A)  depth of thread 
B)  height of thread 
C)  width per thread 
D)  length per thread

Question 8

The letters ____ are included on the drawing specifications to indicate when a left-hand thread is required.

Accepted Answer

A)  LH 
B)  LHT 
C)  LT 
D)  LTH 
A)  LH 
B)  LHT 
C)  LT 
D)  LTH

Question 9

Explain how the right-hand and left-hand screws are advanced.

Accepted Answer

As the terms imply, a right-ha

Question 10

Describe how a tap is used.

Accepted Answer

One of the most practical and widely use

Question 11

The accuracy between an external and an internal thread is specified in trade handbooks and manufacturer's tables as a ____.

Accepted Answer

A)  thread fit 
B)  thread form 
C)  thread class 
D)  thread code 
A)  thread fit 
B)  thread form 
C)  thread class 
D)  thread code

Exam 20: Representing and Specifying Internal and Left-Hand Threads

Discuss dimensioning a thread hole.

List and describe the three regular class fits for internal and external threads.

One of the most practical and widely used methods of producing internal threads is to cut them with a round, formed, thread-cutting tool called a ____.

How are the three regular classes of fits for external and internal threads distinguished from one another?

The accompanying figure is an example of a(n) ____ thread.

Describe how a part can be threaded.

In the case of internal threads, the thread length is specified as the ____.

The letters ____ are included on the drawing specifications to indicate when a left-hand thread is required.

Explain how the right-hand and left-hand screws are advanced.

Describe how a tap is used.

The accuracy between an external and an internal thread is specified in trade handbooks and manufacturer's tables as a ____.

Bases for Blueprint Reading and Sketching

The Alphabet of Lines and Object Lines

Hidden Lines and Center Lines

Extension Lines and Dimension Lines

Projection Lines, Other Lines, and Line Combinations

Three-View Drawings

Arrangement of Views

Two-View Drawings

One-View Drawings

Auxiliary Views

Size and Location Dimensions

Dimensioning Cylinders, Circles, and Arcs

Size Dimensions for Holes and Angles

Location Dimensions for Points, Centers, and Holes

Dimensioning Large Arcs and Base Line Dimensions

Tolerances Fractional and Angular Dimensions

Tolerances Unilateral and Bilateral, Decimal Dimensions

Interchangeable Parts, Allowances, and Classes of Fit

Representing and Dimensioning External Screw Threads

Dimensioning Tapers and Machined Surfaces

Dimensioning With Shop Notes

Metric System Dimensioning and Iso Symbols

First-Angle Projection and Dimensioning

Metric Screw Threads, Dual Dimensioning, and Tolerancing

Cutting Planes, Full Sections, and Section Lining

Half Sections, Partial Sections, and Full Section Assembly Drawings

Datums Ordinate and Tabular Dimensioning

Geometric Dimensioning, Tolerancing, and Datum Referencing

Caddcamcim and Robotics

Welding Symbols, Representation, and Dimensioning

Surface Development and Precision Sheet Metal Drawing

Detail Drawings and Assembly Drawings

Sketching Horizontal, Vertical, and Slant Lines

Sketching Curved Lines and Circles

Sketching Irregular Shapes

Sketching Fillets, Radii, Rounded Corners, Edges, and Shading

Freehand Vertical Lettering

Freehand Inclined Lettering

Orthographic Sketching

Oblique Sketching

Isometric Sketching

Perspective Sketching

Pictorial Drawings and Dimensions

Two-Dimensional and Three-Dimensional Cad Sketching

Proportions and Assembly Drawings

Filters